饼图不允许负值

pie doesn't allow negative values

我正在尝试使用 Matplotlib 绘制饼图,尽管没有出现负值,但我一直收到错误 "pie doesn't allow negative values"!

contrib = sales_data.groupby('Region')['Sales2016'].sum().round().reset_index()
contrib["Percentage"] = (contrib.Sales2016/sum(contrib.Sales2016))*100
contrib = contrib.drop(columns = ["Sales2016"])
contrib.plot(kind = "pie", subplots = True).plot(kind = "pie",subplots=True,legend=False,figsize=(12,5),autopct="%.2f%%")
plt.show()

是否可以指出我哪里出错了?以下是 contrib 的输出:

Region  Percentage
0   Central 32.994771
1   East    42.701319
2   West    24.303911

在饼图中定义参数 y

 contrib.plot(kind = "pie",y="Percentage",labels=['Region'],legend=False,figsize=(12,5),autopct="%.2f%%")